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Pinout and signal descriptions
30
NS9750 Hardware Reference
Y25 idsel
3, 4
N/A I Initialization device select:
For PCI host applications, connect to
AD11.
For PCI device applications, connection
is determined by the PCI device number
assigned to the NS9750.
For CardBus applications, connect to the
external pullup resistor.
Do not allow input to float in any
application.
T24 irdy_n
2
N/A I/O Initiator ready
P24 par
1
N/A I/O Parity signal
R25 perr_n
2
N/A I/O Parity error
R26 serr_n
2
N/A I/O System error
Input:
pci_central_resource_n = 0
Output: pci_central_resource_n = 1
R24 stop_n
2
N/A I/O Stop signal
T25 trdy_n
2
N/A I/O Target ready
AC24 pci_arb_gnt_1_n
6
N/A O PCI channel 1 grant
AD23 pci_arb_gnt_2_n
6
N/A O PCI channel 2 grant
AE24 pci_arb_gnt_3_n
6
N/A O PCI channel 3 grant
AD25 pci_arb_req_1_n
2
N/A I PCI channel 1 request
AB23 pci_arb_req_2_n
2
N/A I PCI channel 2 request
AC22 pci_arb_req_3_n
2
N/A I PCI channel 3 request
AF23
pci_central_resource_n
D N/A I PCI internal central resource enable
AF25 pci_int_a_n
2
N/A I/O PCI interrupt request A, output if external
central resource used
AF24 pci_int_b_n
2
N/A I/O PCI interrupt request B, CCLKRUN# for
CardBus applications
AE23 pci_int_c_n
2
N/A I PCI interrupt request C
Pin # Signal name U/D
OD
(mA)
I/O Description
Table 8: PCI interface pinout